<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
  </head>
  <body>
    <script type="text/javascript">
    function tulin(say) {
      switch (say) {
        case "鸡蛋":
      console.log('吆');
        break;
        case '吆':
        console.log('不要');
          break;
        default:

      }

    }
    tulin('鸡蛋')
    tulin('吆')


    </script>
  </body>
</html>
